PERIODIC TABLE ALL ELEMENT
Atomic mass: 1.00784 u Atomic number: 1 Electron configuration: 1s1 Discovered: 1766 Electrons per shell: 1
Symbol: He Atomic mass: 4.002602 u Atomic number: 2 Electron configuration: 1s2 Boiling point: -268.9 °C Electrons per shell: 2
Symbol: Li Atomic mass: 6.941 u Atomic number: 3 Electron configuration: [He] 2s1 Van der Waals radius: 182 pm Atomic radius: 152 pm Electrons per shell: 2,1
Symbol: Be Atomic number: 4 Atomic mass: 9.012182 u Electron configuration: [He] 2s² Van der Waals radius: 153 pm Electrons per shell: 2,2
Symbol: B Atomic number: 5 Atomic mass: 10.811 u Electron configuration: [He] 2s22p1 Electronegativity: 2.04 Electrons per shell: 2,3 Atomic radius: 85 pm